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2026 in LLMs (so far)

SpeculationModelSep 27, 2026

The author delivered the closing keynote at the WeAreDevelopers World Congress North America in San Jose, with the video available on YouTube. The talk reviews 2026's LLM trends, beginning with the November 2025 releases of Claude Opus 4.5 and GPT-5.1, which made coding agents Claude Code and Codex shift from "often make mistakes" to reliable daily tools. The speaker also describes personal themes of the year, including AI mania and over-ambitious projects.

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Claude CodeModelCodexModelYouTubeCompanyClaude Opus 4.5ModelWeAreDevelopersCompanyGPT-5.1Model
Canonical: https://simonwillison.net/2026/Sep/27/2026-in-llms-so-far/